Magnesium alloy electroless plating nickel and free-chromium pre-processing technology and inhibition treatment solution thereof

A technology for electroless nickel plating and solution treatment, applied in liquid chemical plating, metal material coating technology, chemical instruments and methods, etc., can solve problems such as complex process, environmental pollution, difficult recycling, etc., and achieve simple and integrated treatment methods Good, good corrosion resistance

Inactive Publication Date: 2009-12-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is complicated in process, and the use of heavy metal ion manganese will cause problems such as difficult recovery and environmental pollution.

Method used

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  • Magnesium alloy electroless plating nickel and free-chromium pre-processing technology and inhibition treatment solution thereof
  • Magnesium alloy electroless plating nickel and free-chromium pre-processing technology and inhibition treatment solution thereof
  • Magnesium alloy electroless plating nickel and free-chromium pre-processing technology and inhibition treatment solution thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The sample is a die-cast AZ91D magnesium alloy. Do as follows:

[0026] 1. Mechanical pretreatment: Grinding with 600# sandpaper to remove burrs, release agents, loosely attached cold-worked metal shavings, oxides, etc. on the surface of the cast magnesium alloy.

[0027] 2. Acetone degreasing: ultrasonic cleaning with acetone for 10 minutes.

[0028] 3. Corrosion inhibition treatment: the corrosion inhibition treatment solution uses water as the solvent, and each liter of the solution contains 2 ml of oleoyl sarcosine and 0.2 g of sodium hydroxide, treated at 30 ° C for 30 minutes, and then dried at 80 ° C After 15 minutes, the surface of the magnesium alloy is completely covered by a layer of uniform silver-white corrosion inhibitor protective film to protect the magnesium alloy from corrosion.

[0029] 4. Dilute acid pickling: The dilute acid solution is hydrochloric acid with a weight concentration of 0.5%, and it is treated at room temperature for 10 minutes, so ...

Embodiment 2

[0037] The sample is a die-cast AZ91D magnesium alloy. Do as follows:

[0038] 1. Mechanical pretreatment, acetone degreasing and corrosion inhibition treatment are the same as in Example 1.

[0039] 2. Dilute acid pickling: the dilute acid solution is 0.5% dilute sulfuric acid by weight, and it is processed at room temperature for 15 minutes.

[0040] 3. Hydrofluoric acid activation: the activation solution is hydrofluoric acid aqueous solution, with water as solvent, containing 150 milliliters of hydrofluoric acid solution in every liter of activation solution, and the weight concentration of hydrofluoric acid solution is 40%. minute.

[0041] 4. The bath composition and process parameters of electroless nickel plating are the same as in Example 1.

[0042] The magnesium alloy electroless nickel plating layer obtained by the above method is bright and tidy, the results of scratch test detection and metallographic observation of the coating cross-section are similar to tho...

Embodiment 3

[0044] The sample is an extruded AM60B magnesium alloy. Do as follows:

[0045] 1. Mechanical pretreatment, acetone degreasing and corrosion inhibition treatment are the same as in Example 1.

[0046] 2. Dilute acid pickling: the dilute acid solution is dilute nitric acid with a weight concentration of 0.5%, and it is processed at room temperature for 15 minutes.

[0047] 3. Hydrofluoric acid activation: the activation solution is hydrofluoric acid aqueous solution, with water as the solvent, containing 250 milliliters of hydrofluoric acid solution in every liter of activation solution, and the weight concentration of the hydrofluoric acid solution is 40%. Activate at room temperature for 10 minute.

[0048] 4. The bath composition and process parameters of electroless nickel plating are the same as in Example 1.

[0049] The magnesium alloy electroless nickel plating layer obtained by the above method is bright and tidy, the results of scratch test detection and metallogra...

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Abstract

The invention discloses a magnesium alloy chemical nickelage chromium-free preliminary treatment technique and inhibition treatment solution used by the technique, belonging to the magnesium alloy surface treatment field. The technique comprises the following steps of: firstly, mechanical pretreatment, which is to perform mechanical grinding on the magnesium alloy surface; secondly, acetone degreasing, which is to perform ultrasonic cleaning of acetone; thirdly, inhabitation treatment, which is to perform inhabitation treatment by utilization of water solution which contains oleoyl creatine and sodium hydroxide as inhabitation treatment solution; fourthly, acid cleaning through diluted acids, which is to perform acid cleaning by utilization of diluted acid solution; fifthly, activation through hydrofluoric acids, which is to perform activation by utilization of hydrofluoric acid water solution as activating solution; sixthly, chemical nickelage. The inhabitation treatment solution uses water as solvent and each liter inhabitation treatment solution contains 0.2 to 20 milliliters of oleoyl creatine and 0.02 to 10 grams of sodium hydroxide. The technique has the advantages of simple technique and no chromium element environmental pollution.

Description

technical field [0001] The invention relates to a magnesium alloy electroless nickel plating process, in particular to a magnesium alloy electroless nickel plating chromium-free pretreatment process and a corrosion inhibition treatment solution used therein, belonging to the field of magnesium alloy surface treatment. Background technique [0002] As the lightest engineering structural material, magnesium alloy has many excellent physical and mechanical properties, such as high specific strength, good rigidity, good shock absorption, can withstand large shock and vibration loads, good electrical and thermal conductivity, anti-electromagnetic interference and Good shielding and other performance advantages, it is widely used in automotive, aerospace, electronics, communications, military, optical instruments and computer manufacturing and other fields. However, since magnesium is a metal with extremely strong electronegativity, magnesium alloys have strong chemical activity, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/18B08B3/12C23F11/06C23G1/12C23C18/32
Inventor 丁培培凌国平
Owner ZHEJIANG UNIV
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